Sectional high-potential insulator.



S. S. SUNNEBORN. SECTIONAL HIGH POTENTIAL INSULAOR.

MPucmou mtu oms. 191s.

Patnted' Oct. 9, 1917.

Matton/:m3 i

00 if l N /f//VV UNITED sTATEs PATENU." oEEIoE.

SOL S; SONNEBORN, F BROOKLYN, NEW YORK.`

SECTION'AL HIGH-POTENTIAL INSULATOR.

To all whom it may concem:

Beit known 'that I, SOL S. SONNEBORN, a

citizen of the United States, and a resident of Brooklyn, county ofKings, and State of New Yorlnhave invented certain new and usefulImprovements in VSectional Hi h-Potential Insulators, set forthY in the4 ollowin specification. y

his invention relates to high-potential insulators" of the condensertype', employed as bushin for insulatingtransfomer leads and the li efrom what is usually a grounded, perforated barrier of conductingmaterial "through which the conducting lead must emerge and from whichvit must be insulated.

The object of the invention is to form an insulator 'of' as simple,compact and economical construction as possible, land which rovidesprotectivefe'atures against hi hgre'quency, high-potential oscillations,ue to abnormal lllne surges as well as embodying :in eilicient designfor the normal voltages whichY itv is expected to sustain.

" 'Ifo these ends an' important feature of the invention is toprovidefor relief without danger of puncture from abnormal stressproduced `by high-frequency oscillations, while at the same timeemploying features such as dielectric configuration -lconforming to theflow lines'. of die ectric stress between Y terminals,`to the end that'thefiill dielectric value of the air may be employed.' The moreparticularobject of the present invention is to attain the aboveadvantages in an insulator the insulating material of which isa suitablevitried product such as porcelain. :A still further obect of the'present invention is to obtain t e aforementioned broad objects in asectionalinsulator ,to 'the end that, in 4the unlikely eventof a uncturebetweenA anyof the condenser .sectlons, the entire insulator may berestored to perfect condition merely by replacing the puncturedsection.`

Theabove and more detailed objects of the invention 'will more :fully beunderstood by reference toltheembodiment of the inventiondescribed forillustrative purposes in the following specification and shown in theaccompanyingldrawnigs, which form a part hereof, in w. ich likecharacters designate corresponding parts in the figures and Specicatimiyof Letters Patent.

i --Atpplicatien filed December 9, 1916. Serial o. 135323. 4

in which Figure 1 is aseotional elevation and Fig. 2 isa fra mentarysectional elevation showing a mo ification.l

` In the illustrative embodiment of my invention I have shownfaninsulating highpotential `bushing of the condenser type, built u'p outof three majorV coaxial cylindrical sections 1, 2 and 3,4 each injtheembodiment of a comparativel simple vitried porcelain structure'.ternating with these insulatin sections, forming partitions, are two cyindrical sheet metal sheaths 4 and 5. Each section of insulatingmaterial 0in to make up the complete insulator A soul firstl becompleted and individuell tested, then the assembling of the entireinsulator may be effected.

The outer insulating section 1 may have a protecting bushing 6 of sheetmetal spun about itJ the bushin being completed except for themturningofgthelip 7 about the ledge 8. Next the sheath 4 is insertedfrom the top downward into Vthe section 1 and is initially formed withan outwardly flaring skirt atits. upper end. When inserted within theporcelain section 1, its lower end is spun outwardly to 4 form thebottom outflarin skirt 10. The outward spinning of the skirt I() may befacilitated by the slitting of the bottom end of the sheath 4 or bycutting out triangular sections. Next the composlte structure,comprising the bushing 6, the section 1 and the sheath 4 is slipped fromthe bottom upwardly over the intermediate section 2, which is formedwith an out-flaring petticoat 11, counter-cut on its under side toreceive the skirt 9. A cylindrical bushing113 is then slipped over theprotruding en 14 of the intermediate section 2. The'inner sheath 5 isthen slipped into the intermediate section 2 from the upper end, and itsbottom end is then spun outwardly toV -form the out-flaring skirt 15 ina manner similar to the forming of the skirt 10. The sheath 5 then, withits out-Haring skirt 15, locks the parts so far assembled together. Theinner sheath then, with its attached parts, is slipped upwardly from thebottom end over `.the central section 3, which is formed at the top withone or more petticoats 16 and 17, the lower petticoat being countersunkto accommodate the out-flaring outer skirt 18 of the sheath 5. The upperp ortion of the central section may be provided with a knob 19 toreceive the metal cap 20` and is centrally cored to receive theconducting bolt 21. A porcelain bushing 25 is then slipped over thebottom end of the central section 3 and it may be locked in place by ametal washer 26 and suitable nuts 27, applicable to the threaded ends 28and 29 of the bolt 2l, and serving thc combined purposes of maintainingthe complete structure assembled, relieving electrofstatic stress andproviding ready means for electric coiinections. Although I havedescribed the formation of the skirts such as 9, 10, 15 and 1S byspinning out a flange from the integral metal of the sheath, it is tobeunderstood that this is merely a preferred method and that theinvention covers broadly sheaths having skirts formed in any convenientmanner and by no means of necessity in the form o an outwardly spunflange forming an integral part with the remainder of the sheath.

. As a modification of the bushing 25, which is centrally,cylin'drically perforated, a cup- Vshaped bushing 26 may be substitutedby slightly shortening the central section 3, as shown in the modication30.

W'henvin use, this structure is adapted to combine air and porcelain asits insulation above the ledge 8 and porcelain and oil below the ledge8, inasmuch as in general use the portion of the insulator belovi7 theledge 8 projects usually within the oil filled metal housing of somestructure such as a transformer, so that the oil level is above theoutstanding skirts such as 10 and 15. By this provision an arc-over fromone of the skirts such as 10 or 15 to the bushing 6 is therefore snuffedand the oil self-healing immediately upon its cessation. The breakdowndistance from the ledges 15 and 10 under the conditions of service isintended to be less than that from any of the outer parts of theinsulator.

It is of course to be understood that the composite insulator is notlimited to the exact number of parts or to the exact configuration ofparts illustrated. The arrangement of the metal cap, washer, sheaths andbushing, and the configuration of porcelain barriers is such as torelieve all local tensions directly betn'een the porcelain partitions,so that the combined insulating effect of the porcelain is renderedapproximately proportional to its total thickness. The exposed surfacesof the petticoats are intended .to be a compromise between protectionaffainst surface leakage and positioning along the flow lines of staticstress.

What I claim and what I desire to secure by United States Letters Patentis:

1. A high-potential, insulating bushing of the condenser type comprisinga plurality of separable nesting cylindrical sections of insulatingmaterial; and one or more cylindrical metal sheaths alternating withsaid sections, one saidssheazthihaving artoutwardly flaring skirt ateach end.

2. A high-potential insulated lead-in bushing OI, suchwdmuces astransformers (-,oniprising a plurality of separable coaxial nestedsetions -of 4insulating material; a metallic sheath located between tWoof said nestedV sections to give a condenserfft; and a conductorextending axially through said sections and having at each end aradially extensive conducting member substantally in the form of a solidof nevolutiion, both of which serve asl` electrostatic stressdistributers and at least one of which maintains the assemblage fof saidseparable sections.

3. A high-potential insulator sampiislg a plurality of separablecoaxial.nestedl sec? tiens; and a metaili-sbsathflacated; between efihpair 0i .adiaeeat sectiaas, beth. cada. ef Sudt sheath having: an4(inwardly SlI 4- A high-potential. iisiiiatcnaamiirisivg a plurality o..sepamhlecoaxial neftd .Secr tiens; a .metallic sheathloabed between.cash pair of adjacent sections, both ends Qfgaid sheath having anoutwardly-.Haring .skirt und end. Sections 0f insulating materiel afenlarged .diameter insulating Sai il-i1arsd ends `in an axially outwarddiiiection. i

5- A highfpatiital insulating bushin 0.f the condenser type comprising,a [inra ity of separable cylindrical 'sectimsfbfllinsnl tma material; ametallic @andenes- Shelli between tw@ adjacent :Semanas the` aat'esection having a circumjerentialsupporting ledge; anda Sheet-.metalSheath'loc fellas a combined mechanial-ptatat0ran evitra; Stati@ .Stressydist.iihutai abaiitsai. `eviter non including saidgsu'ppcitingla ge` G.A. higli-noteatialinsulableg buSh, ai the condenser ty e comprising@.Plaruy of ,nested indiyi' ual cylindricalsectioiis of insulatingYmaterial; a. metalliaalieath-.laf cated between each .two adj sentsections; at Vleast one ntsaid metallica eaths, avia a ponan at one end.outwardly tiara an.. forming bath a Hang@ mehaniaally`teding to hold a,nluralty af ,salidlsectnsip as# semblement .and an .eleatrlc relief4marcher.-

7 A high-.potential 119.5ulink-iria hashing Comprising. a. maior sectionof 'cylm contour having at its top one .or 'morgenpwardly flaringpetticoats :and a dependent tubular sleeve; a metallic sheath "incsinSaid .tubular sleeve; a Second. Cylin. wel portion of insulatingmaterial nes'tedabavt said metallicsheath; and means fonhold.- ing saidpartsV in assembled relatim.V

8. A highpotential insulating. bushing comprising one section havingencor vmgm outwardly Haring peLtiOats and' Q neor.- tubular portions;Vone. ,or more gee:

tions of insulating material, each nested said petticoats; and means forholding the about the tubular portion of another secparts in assembledrelation comprising an tion; and a metallic condenser sheath loaxialconductor. 10 cated between one o1' more pairs of ad- In Witness whereofI have signed my jacent sections of insulating material and name to thisspecification, this 8th day of having an outwardly Haring skirt conform-December, 1916.

ing in configuration to one face of one of SOL S. SONNEBORN.

Copies of this patent may be obtained for ve cents each, by addressingthe "Commissioner of Patents,

Washington, 11.0.

